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ABNF for SDP
RFC 4566and many other RFCs

Session Description   v=   o=   s=   i=   u=   e=   p=   c=   b=   t=  r=  z=   k=   a=   m=   SDP Addressing   SDP generic rules   "a=" SDP Attributes
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SDP attributes defined in

RFC 6364 – SDP Elements for the FEC Framework

RFC 6364Section 4.4

 


attribute-fields  =/
fec-repair-flow-line =
"a=fec‑repair‑flow:"  SPfec‑encoding‑id  [ ";"  SPflow‑preference ]
[ ";"  SPsender‑side‑scheme‑specific ]  [ ";"  SPscheme‑specific ]  CRLF
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fec-encoding-id =
"encoding‑id="  enc‑id
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enc-id =
1*DIGIT
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flow-preference =
"preference‑lvl="  preference‑level‑of‑the‑flow
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preference‑level‑of‑the‑flow =
1*DIGIT
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sender-side-scheme-specific =
"ss‑fssi="  sender‑info
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sender-info =
element  *( ","  element )
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scheme-specific =
"fssi="  scheme‑info
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scheme-info =
element  *( ","  element )
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repair-window-line =
"a=repair‑window:"  window‑sizeunitCRLF
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window-size =
%x31‑39   *DIGIT
; represented as 32‑bit non-negative integers
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unit =
"ms" /  "us"
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fec-source-flow-line =
"a=fec‑source‑flow:"  SPsource‑id  [ ";"  SPtag‑length ]  CRLF
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source-id =
"id="  src‑id
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src-id =
1*DIGIT
; represented as 32‑bit non-negative integers, and leading zeros are ignored
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tag-length =
"tag‑len="  tlen
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tlen =
%x31-39   *DIGIT
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element =
name  ":"  value
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name =
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token =
1*<any CHAR except CTLs or separators>
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value =
*<any CHAR except CTLs or separators>
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separator =
"(" /  ")" /  "<" /  ">" /  "@"   /
"," /  ";" /  ":" /  "\" /  DQUOTE   /
"/" /  "[" /  "]" /  "?" /  "="   /
"{" /  "}" /  SP /  HTAB
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